Dollar Extends Winning Streak

There’s no such thing as a one-way bet in financial markets, but the dollar’s past three-month performance sure looks like one in hindsight.

On Friday, after another day of solid U.S. economic data and disappointing numbers overseas, the ICE dollar index posted its 12th-straight weekly gain. That’s the longest such streak ever for the index, which was created in 1973 when the Bretton Woods system of managed exchange rates was dismantled. Before this latest run, the longest streak for the ICE index had been nine consecutive...